The documentary film "PlantPure Nation" will be screened at 7 p.m. Monday at Cinemapolis in Ithaca, followed by a question-and-answer session with T. Colin Campbell, co-author of "The China Study" and Cornell University professor emeritus in the division of nutritional sciences.

Campell's son, Nelson Campbell, is director of the film, which premiered in June and has been seen in more than 25 cities. The film is produced by John Corry,the producer and writer of the film "Forks over Knives"